I see nothing negative in that article.
A GSD is definitely Not for everyone, but especially first timers, who might know nothing about dogs and their behavior.
I actually agree with what they said:
"Highly intelligent and natural protector, the German Shepherd Dog is well-suited to a wide variety of jobs: He’s worked as a guide dog, a drug sniffer, and, of course, a police and military dog. There’s little he can’t do with the right training, but that’s exactly why he’s not ideal for newbies — it takes quite a bit of training, exercise and dedication to stay “smarter” than he is."